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  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
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<body>
  <script>
    // 什么情况下异步函数的结果是reject
    async function foo() {
      console.log("-----------1")
      console.log("-----------2")
      "abc".filter()
      console.log("-----------3")
      
      // return 123

      // return new Promise((resolve, reject) => {
      //   reject("err rejected")
      // })
    }

    // promise -> pending -> fulfilled/rejected
    foo().then(res => {
      console.log(res)
    }).catch(err => {
      console.log(err)
    })
  </script>
</body>

</html>